A new scheme to reduce PAPR of the OFDM system combining Hann Peak Windowing and Single Pooling method

摘要

Wireless communication is the fastest increasing industry. In such enabling technologies Orthogonal Frequency Division Multiplexing (OFDM) is more effective and significant for both wired and wireless communication systems in the present and future. It has a lot of advantages. But some common problems such as channel noise, Doppler shift frequency effects, peak to average power ratio (PAPR), channel detection, time synchronization error, and phase error limit the performance of the OFDM system. Among them, the time domain OFDM signal which is the sum of several sinusoids leads a high peak to average power ratio (PAPR) is one of the major disadvantages of OFDM system. In this thesis, we study the PAPR problem of the OFDM system. There are many conventional techniques to reduce the PAPR problem. The techniques which were studied through this thesis are Simple Clipping, Hann Peak Windowing, Kaiser Peak Windowing, Hadamard Transform, Single Pooling method and combining method of Hadamard Transform and Single Pooling method. We have been able to realize these techniques comparative performance for bit error rate and PAPR problem. Besides, a new scheme is combining of Hann Peak Windowing and Single Pooling method technique, which is more effective to reduce the PAPR problem in an OFDM system, which is being proposed in this thesis. Implementing those technique effects is using simulation software MATLAB 2010 and the performances were analyzed with this platform.